There is no scientific evidence of this at all, particularly in developed countries. In fact, many medical practitioners internationally do not encourage it as it is completely unnecessary. There are many countries who no longer routinely circumcise infants and have been for some time, and those countries are not experience issues because of this en-masse. Yes, sometimes a circumcision is required, but sometimes we need to remove tonsils too. But we don't routinely remove them at birth.